clip.h

来自「g729 coding ipaddressing」· C头文件 代码 · 共 54 行

/**************************************************************************
*
* ROUTINE
*				clip
*
* FUNCTION
*				determine if speech is clipped
*
* SYnoPSIS
*				function clip(s, l)
*
*	formal 
*
*						data	I/O
*		name			type	type	function
*		-------------------------------------------------------------------
*		s				float	i		input speech
*		l				int 	i		length of input speech
*
***************************************************************************
*
* CALLED BY
*
*		celp
*
* CALLS
*
*
*
**************************************************************************/

static int clip(float s[], int l)
{
  int i, count;
  float sum;

  /*	Count number of clippings and sum their magnitudes				*/

  count = 0;
  sum = 0.0;
  for (i = 0; i < l; i++)
  {
	if (fabs(s[i]) > 32768.0)
	{
	  count++;
	  sum += (float) fabs(s[i]);
	}
  }

  /*	Clipping heuristics (could also use energy, delta energy, etc.) */

  return(((count >= 10) || (count >= 5 && sum > 1.e6)) ? TRUE : FALSE);
}